Nonlinear generation of broadband polarisation vortices
2010; Optica Publishing Group; Volume: 18; Issue: 22 Linguagem: Inglês
10.1364/oe.18.023212
ISSN1094-4087
AutoresSiddharth Ramachandran, Christian Smith, Poul Kristensen, Péter Balling,
Tópico(s)Laser-Matter Interactions and Applications
ResumoPolarisation-vortex beams over a broad wavelength region are generated by nonlinear transformation of a radially-polarized mode in a specially-designed optical fiber. The beams are produced by stimulated Raman scattering from 20-ns 1064-nm laser pulses, and up to the 4th order Stokes shift is observed. Measurements of polarization-selected intensity profiles of individual Stokes components show that the generated light maintains the desired spatial intensity distribution and radial polarization of the pump mode. At the highest pump power, 300 W, the process creates a coherent vortex beam from 1064 nm to 1310 nm, which is a span of nearly 250 nm.
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